The correct option that expresses the given sentence in active voice is:

☀ He had written three novels and two story books before 2020.

So, the correct active form is: "He had written three novels and two story books before 2020."

The other options and their explanations:

☀ He has been writing three novels and two story books before 2020.

• This option is in the present perfect continuous tense ("has been writing") and does not match the past tense used in the original sentence.

☀ He had been writing three novels and two story books before 2020.

• This option is in the past perfect continuous tense ("had been writing") and does not match the simple past tense of the original sentence.

☀ He wrote three novels and two story books before 2020.

• This option is in the simple past tense, which matches the past perfect tense of the original sentence. However, it does not include the correct tense marker "had" that is present in the original sentence. The correct option with the same tense would be "He had written three novels and two story books before 2020."